Journal of the Anthropological Society of Nippon
Online ISSN : 1884-765X
Print ISSN : 0003-5505
ISSN-L : 0003-5505
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Volume 84, Issue 1
Displaying 1-4 of 4 articles from this issue
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  • Power Spectral Analysis of Surface Electromyograms during Isometric Contractions
    Haruhiko SATO
    1976 Volume 84 Issue 1 Pages 1-14
    Published: 1976
    Released on J-STAGE: February 26, 2008
    DOIhttps://doi.org/10.1537/ase1911.84.1
    JOURNAL FREE ACCESS
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    The power spectra of the bipolar surface EMG during isometric contractions for various human skeletal muscles were obtained for the frequency range from 6 to 378 Hz by the autocorrelation and its Fourier transformation technique. The effect of small movement artifact appeared in the frequencies below 10 Hz and the effect of the ECG around 15 Hz. Although there were some variations in the EMG power spectra of a muscle among subjects, there existed different EMG power spectrum patterns for different muscles. The significant energy of the EMG was within a frequency range approximately from 10 to 200 Hz in the biceps brachii, triceps brachii, brachioradialis, pectoralis major, vastus medialis and lateralis, tibialis anterior, deltoid and rectus femoris with some variations among these muscles. On the other hand, the power spectra of the gastrocnemius, masseter and f rontalis were broadened and they had also significant energy above 200 Hz.
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  • Longitudinal Observation on the Limb Growth of Japanese-American Hybrids with Special Regard to Seasonal Variation
    Akiyoshi SUDA, Hiroshi HOSHI, Moriharu ETO, Kumi ASHIZAWA
    1976 Volume 84 Issue 1 Pages 15-30
    Published: 1976
    Released on J-STAGE: February 26, 2008
    DOIhttps://doi.org/10.1537/ase1911.84.15
    JOURNAL FREE ACCESS
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    Somatometric analysis was done on longitudinal data of limb growth obtained from 60 male and 31 female Japanese-American hybrids. It revealed the hybrids had the longer upper limbs than the Japanese and the shorter lower limbs than the Americans. It was suggested that the growth of the upper limb might have been influenced rather strongly by the American characters and that of the lower limb by the Japanese characters. In the girth growth of the limb, however, no significant difference was found between the hybrids and either parental groups. Analysis of seasonal variation revealed that (1) the limb gained in length more markedly in spring and in girth in autumn than any other season, that (2) the upper limb reacted to the seasonal influence earlier than the lower, that (3) the proximal part of the limb reacted to such influence earlier than the distal, that (4) seasonal effect varied from one individual to another as well as from one year to another even in the same individual. The maximal velocity of limb growth occurred one or two months after the Equinox Day. Discussion was made on a relationship between seasonal cycle of growth velocity and the length of day and night.
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  • The Bilateral Mesiopalatal Rotation of Upper Central Incisors
    Ariko IIZUKA
    1976 Volume 84 Issue 1 Pages 31-47
    Published: 1976
    Released on J-STAGE: February 26, 2008
    DOIhttps://doi.org/10.1537/ase1911.84.31
    JOURNAL FREE ACCESS
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    The purposes of this paper are to study the appearing frequencies of the bilateral mesiopalatal rotation of upper central incisors among the Japanese and the Pashtun, and to determine the genesis of this feature. The author observed the mesiopalatal rotation of upper central incisors by DAHLBERG's classification and measured the rotative angle by ROTHHAMMER's method. Relationships between the rotative angle and the size of front teeth, dental arch, palate, upper protrusion, overbite, molar relation or space available for two incisors were also investigated. The materials of the Japanese and the Pashtun were the plaster casts. The results are summarized as follows:
    1. The rotative angle is larger among the Japanese than among the Pashtun. And the frequency of the mesiopalatal rotation is higher among the Japanese than among the Pashtun.
    2. The positive relationships between the rotative angle, and the breadth of dental arch and of palate were observed. The negative relationship between the rotative angle and the length of anterior dental arch was observed. No significant relationships were found between this feature and the above factors, such as size of front teeth, space available for incisors, upper protrusion, crowding and spacing,
    3. The evidences adduced above suggest that this feature is not the same phenotype of tooth crowding, and the genesis of this feature is not due to local factors but due to heritable factors.
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  • Correction to the Metacarpale I of the Amud Man A New Description Especially on the Insertion Area of the M. opponens poiicis
    Tasuku KIMURA
    1976 Volume 84 Issue 1 Pages 48-54
    Published: 1976
    Released on J-STAGE: February 26, 2008
    DOIhttps://doi.org/10.1537/ase1911.84.48
    JOURNAL FREE ACCESS
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    The first metacarpal bones of the Amud man, a Neanderthal man found in West Asia in 1961, was described by the present author in 1970. In that paper, he was mistaken the bone in regard to its side. The corrected new description on the first metacarpals of the Amud man was given in this paper.
    The author reexamind the differences between the right and left first metacarpals on the recent and prehistoric bones. The radial impression for the M. opponens pollicis develops well to become a flange on the Amud bone. This characteristic can not only be seen in the Neanderthal man but is also seen in the muscular prehistoric people.
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